Dr. JOHN GREHAN is a board-certified cardiothoracic surgery specialist based in SIOUX FALLS, South Dakota, bringing 20 years of dedicated clinical experience to patient care. Dr. GREHAN has performed over 8.8k procedures and published 37 peer-reviewed research papers, reflecting a deep commitment to advancing medical knowledge in cardiothoracic surgery.
With advanced training in thoracic surgery (cardiothoracic vascular surgery), Dr. JOHN GREHAN combines clinical expertise with the latest evidence-based practices to deliver personalized treatment plans. Dr. JOHN GREHAN holds 1 medical patent, demonstrating innovation in surgical techniques and medical devices.
Dr. JOHN GREHAN maintains an active role in the medical community through ongoing research, peer collaboration, and continuing medical education. This commitment to staying at the forefront of cardiothoracic surgery ensures patients receive care informed by the latest advances in the field.
1 patents
Dr. JOHN GREHAN provides comprehensive diagnosis and treatment for the following conditions:
Heart Valve Disease - valve repair or replacement surgery.
Learn more about Heart Valve Disease treatmentCoronary Artery Disease - narrowed heart vessels requiring bypass or stenting.
Learn more about Coronary Artery Disease treatment